Gypsum Board Systems. CSI 3-Part Specifications.

SECTION 09250

GYPSUM BOARD SYSTEMS

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Use this guide specification to specify gypsum drywall systems by

U. S. Gypsum Co. incorporating light gauge steel framing members

for construction of partitions, furring, ceilings, soffits and

related assemblies. Review a copy of USG publication SA-923, SA-

927 and SA-932 before editing specification.

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PART 1 - GENERAL

1.01 GENERAL DOCUMENTS:

General and Supplementary Conditions of Contract as well as

Drawings and general provisions of Contract and Division 1

Specification section, apply to work of this section.

1.02 DESCRIPTION OF WORK:

Extent of gypsum drywall work is shown on drawings and

schedules. Types of work included are:

Gypsum drywall including screw type support systems.

Drywall finishing (joint tape and compound treatment.

Ceramic tile back-up systems.

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Include ceramic tile back-up materials if intended to be

installed under this section.

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Coordinate with all trades required to install work on or

into work of this section.

Related Work Specified Elsewhere

Insulation - Section 07200

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THERMAFIBER Brand Sound Attenuation fire blankets are usually

installed as part of this section. Exterior wall insulation in

conjunction with Z-Furring Channels can also be installed as part

of this section.

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Hollow Metal Doors and Frames - Section 08100

Drywall Shaft Systems - Section 09270

Painting - Section 09900

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For best final finish results specify all drywall surfaces to

receive a prime coat of SHEETROCK Brand First Coat primer in

accordance with U.S. Gypsum Co. directions after final joint

treatment and before finish painting.

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Include additional related sections as pertinent.

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1.03 QUALITY ASSURANCE:

Standards:

ASTM C-36 Standard Specification for Gypsum Board

ASTM C-475 Standard Specification for Joint Treatment

Materials for Gypsum Wallboard

Construction.

ASTM C-645 Standard Specification for Non-Load (Axial)

Bearing Steel Studs, Runners (Track), and

Rigid Furring Channels for Screw

Application of Gypsum Board.

ASTM C-754 Standard Specification for Installation of

Steel Framing Members to Receive Screw-

Attached Gypsum Board, Backing Board, or

Water-Resistant Backing Board.

ASTM C-840 Standard Specification for Application

and Finishing of Gypsum Board.

ASTM C-1002 Standard Specification for Steel Drill

Screws for the Application of Gypsum Board.

ASTM C-1047 Standard Specification for Accessories for

Gypsum Wallboard and Gypsum Veneer Base.

Fire-Resistance Rating: Where fire resistance rating is

required, provide materials and installation which are

identical with those of applicable assemblies tested per

ASTM E119 by fire testing laboratories acceptable to

authorities having jurisdiction.

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If mock-up is required identify location at the site, size

required and if special tests will be conducted relative to same

(e.g. sound tests).

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Unit Responsibility: Obtain gypsum board materials

including fasteners, joint treatment products, steel

framing, etc. from a single manufacturer to ensure

consistency in quality of performance and appearance.

1.04 SUBMITTALS:

Product Data: Submit manufacturer's product specifications

and installation instructions for systems used.

Certificates: Submit certification of compliance with fire

and sound requirements indicated.

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Copies of actual fire and sound test reports can be specified for

submittal.

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Samples: Furnish one standard sample of each linear or

continuous product, one standard hand sample of sheet

product, and one sample of all other components required for

project.

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Delete "Samples" paragraph if none required.

Include requirement for shop drawings if necessary.

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1.05 DELIVERY, STORAGE AND HANDLING:

Handling: Handle materials to avoid damage.

Delivery: Deliver materials to the jobsite in original

packages, containers, or bundles bearing the brand name and

manufacturer's identification.

Storage: Store materials in dry locations with adequate

ventilation, free from water, and in such a manner to permit

easy access for inspection and handling. Damaged or

deteriorated materials shall be removed from the site.

1.06 PROJECT CONDITIONS:

Protect adjacent work of other trades from moisture damage,

soiling, physical distress, etc. In cold weather during

gypsum panel joint finishing, temperatures within the

building shall be maintained within the range of 55 to 70F.

Provide adequate ventilation to carry-off excess moisture.

PART 2 - PRODUCTS

2.01 MANUFACTURER:

Subject to compliance with requirements, provide gypsum

drywall, steel framing, and all related components, as

manufactured or supplied by United States Gypsum Co.

2.02 MATERIALS:

A. Gypsum Panels (lengths as long as practical to

minimize number of joints):

SHEETROCK Brand (Regular)(SW Edge)(FIRECODE

Core)(FIRECODE C Core) Gypsum Panels (1/2")(5/8")

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Add 1/4" and/or 3/8" thicknesses (regular core) if required for

project.

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SHEETROCK Brand Foil-Back (Regular)(SW Edge)(FIRECODE

Core)(FIRECODE C Core) Gypsum Panels (1/2")(5/8")

SHEETROCK Brand Water-Resistant (Regular)(FIRECODE

Core)(FIRECODE C Core) Gypsum Panels (1/2')(5/8")

TEXTONE Brand Vinyl-Faced Gypsum Panels

(type)(pattern)(1/2")(5/8")

B. Gypsum Coreboard - SHEETROCK Brand Coreboard, 1"

thick, 24" wide with "V" T&G Edges (length)

C. Exterior Ceiling Board - SHEETROCK Brand Exterior

Gypsum Ceiling Board (1/2")(5/8" FIRECODE)

D. Interior Ceiling Board - 1/2" SHEETROCK Brand Interior

Gypsum Ceiling Board.

E. Cement Board: DUROCK Interior Cement Board; 1/2" thick,

36" wide, (48")(60")(72") long.

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DUROCK Exterior Cement Board; 1/2" thick, 4'x8' may be used for

interior applications. Specify DUROCK Underlayment 5/16" thick,

4'x4' for floors and counter tops.

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F. Steel Studs and Runners (UNIMAST):

(158ST25) (158CR25) (212ST25) (212CR25) (358ST25)

(358CR25) (400ST25) (400CR25)

(600ST25) (600CR25) (212ST22) (212CR22) (358ST22)

(358CR22) (400ST22) (400CR22) (600ST22) (600CR22)

(212ST20) (358ST20) (358CR20) (400ST20) (400CR20)

(600ST20) (362SJ20) (40SJ20)

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Additional studs available in SJ series for increased height or

other special conditions.

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G. Metal Furring Materials:

(Unimast Metal Furring Channels and Clips)

(Unimast Adjustable Wall-Furring Brackets)

(Unimast Cold-Rolled Channels [3/4"][1-1/2"])

(SHEETROCK Z-Furring Channels)

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For cold-rolled channels specify standard painted or galvanized

coating.

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H. Utility Angles: Nominal 2"x2"x24ga., corrosion

resistant steel, lengths as required.

I. Hanger Wire: Galvanized, 9-ga.

Tie Wire: Galvanized, 18-ga.

J. Corner reinforcement: (DUR-A-BEAD Corner Bead No.

[103][104]) (SHEETROCK No. 800)

K. Metal Trim: SHEETROCK Metal Trim No. (200-A

[1/2"][5/8"]) (200-B [1/2"][5/8"]) (400) (401) (402)

(801-A [1/2"][5/8"]) (801-B [1/2"][5/8"])

L. Resilient Channels: RC-1 Resilient Channel.

M. Control Joint: SHEETROCK Zinc Control Joint No. 093.

N. Screws:

SIZE: (3/8")(7/16")(1/2")(1")(1-1/4")(1-1/2")

(1-5/8")(2")(2-1/4")(2-1/2")(3")

Style: (framing - Type [S][S-12]) (drywall - Type S)

(self-drilling - Type S-12) (laminating - Type G)

Head: (bugle)(pan)(trim)(pancake)(low-profile)(mod.

truss)

Coating: (reg.)(corrosion-resistant)

DUROCK steel screws: (1-1/4")(1-5/8")

O. Adhesive: (SHEETROCK Setting Type Joint

Compound)(SHEETROCK Lightweight Setting Type Joint

Compound)(SHEETROCK All Purpose Joint Compound, Ready

Mixed)(SHEETROCK Taping Compound, Ready Mixed)

P. Joint Treatment: SHEETROCK Joint Tape. (SHEETROCK

Setting Type Joint Compound) (SHEETROCK Lightweight

Setting Type Joint Compound) (SHEETROCK Joint Compound

[Taping][Topping][All-Purpose]) (SHEETROCK Ready-Mixed

Joint Compound [Taping][Topping][All-Purpose])

(SHEETROCK Lightweight All-Purpose Joint Compound

Ready-Mixed - Plus 3)

Q. Concrete Finishing Compound: (SHEETROCK Setting Type

Joint Compound) (SHEETROCK Lightweight Setting Type

Joint Compound) (COVER COAT Compound [ready mixed]

[sand added])

R. Caulking: SHEETROCK Acoustical Sealant

S. Water Barrier: Tyvek Housewrap.

T. Insulation: THERMAFIBER Sound Attenuation Fire

Blankets (1")(1-1/2")(2")(3") thick, (16")(24")(25")

wide

PART 3 EXECUTION:

3.01 PARTITION INSTALLATION:

3.01.1 Stud System Installation:

Attach steel runners at floor and ceiling to structural

elements with suitable fasteners located 2" from each

end and spaced 24" o.c. max. To suspended ceilings,

use toggle bolts or hollow wall anchors spaced 16"

o.c.max.

Position studs vertically, with open side facing in

same direction, engaging floor and ceiling runners,

spaced (24" o.c.)(16" o.c.)(as shown on drawings).

Place studs in direct contact with all door frame

jambs, abutting partitions, partition corners and

existing construction elements. Where studs are

installed directly against exterior walls install

asphalt felt strips between studs and wall

surface.

Anchor all studs for shelf-walls and those adjacent to

door and window frames, partition intersections,

corners and free-standing furring to floor and ceiling

runners.with metal-lock fastener tool or screws.

Securely anchor studs to jamb and head anchors of door

or borrowed-light frames by bolt or screw attachment.

Over metal door and borrowed-light frames, place a

horizontal cut-to-length section of runner, with a web-

flange bend at each end, and secure to strut studs with

two screws in each bent web. Position a cut-to-length

stud at vertical panel joints over door frame header.

3.01.2 Resilient Channel Installation:

Position RC-1 Resilient Channels at right angles to

steel studs, space 24" o.c. and attach to stud flanges

with pan head framing screws driven through holes in

channel mounting flange. Install channels with

mounting flange down. Locate channels 2" from floor and

within 6" of ceiling. Extend channels into all corners

and attach to corner framing. Cantilever channel ends

no more than 6". Splice channels by nesting directly

over a stud; screw attach through both flanges.

3.01.3 Sound Attenuation Fire Blanket Installation:

Install THERMAFIBER Sound Attenuation Fire Blankets

after gypsum panels are applied to one side of studs,

or the non-resilient channel side. Fasten to the back

of the gypsum panels using five 9/16" long staples

driven through paper reinforcement strips. Three-inch

thick blankets are friction-fit; insulation equal to or

1/2" less than stud width may be friction fit.

Creased THERMAFIBER Sound Attenuation Fire Blankets -

Insert 25" wide blankets in the stud cavity

by bowing slightly. After inserting make a vertical

cut in blanket about 1-inch deep on a centerline

between the studs with a sharp utility knife.

3.01.4 Gypsum Panel Installation:

Apply gypsum panels (parallel to studs)(perpendicular

to studs). Position all edges over studs for parallel

application; all ends over studs for perpendicular

application. Fit ends and edges closely, but not

forced together. Stagger joints on opposite sides of

partition.

For single-layer application space screws 16" o.c. in

field and at edges and ends. For double-layer

application space screws 24" o.c. in base layer and 16"

o.c. in face layer.. Apply both layers vertically with

joints in face layer offset from base layer joints by

at least one stud. Use 1" screws for base layer and

1-5/8" screws for face layer. Drive screws so

screw heads provide a slight depression below surface

of gypsum panels without breaking face paper. Do not

drive screws closer than 3/8" from edges and ends of

panels.

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For fire-rated partitions check the particular design for

vertical or horizontal application of gypsum panels, and for

screw spacing requirements.

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For double-layer laminated construction attach base

layer with 1" screws 8"o.c. at joint edges and 12" o.c.

in field. Apply face layer vertically with laminating

adhesive spread on back side, joints staggered appx.

12" and fastened to base layer with 1-1/2" laminating

screws. Drive screws appx. 2' from ends and 4' o.c. in

field of panel, 1' from ends and 3' o.c. along a line

2" from vertical edges.

For double-layer laminated non-rated construction,

attach base layer with 1" Type S screws 16" o.c. at

joint edges and in the field of panel. Apply

laminating strips with a notched metal spreader to

center and along both edges of face panel. Install

panels vertically; press into place with firm pressure

to insure bond and fasten top and bottom as required.

For resilient construction apply gypsum panels with

long dimension perpendicular to resilient channels and

fasten with 1" Type S screws 12" along channels.

3.01.5 Cement Board Application:

Install water barrier over face of studs before

proceeding with installation of DUROCK Panels. After

tub, shower pan, or receptor is installed place

temporary 1/4" spacer strips around lip of fixture.

Pre-cut DUROCK Cement Board panels to required sizes

and make necessary cut-outs. Install panels abutting

spacer strips; fit ends and edges closely but not

forced together; stagger end joints in successive

courses. Fasten boards to studs and bottom runners

with 1-1/4" DUROCK Steel Screws 8" o.c., with perimeter

fasteners at least 3/8" and less than 5/8" from ends

and edges.

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Complete installation of DUROCK Cement Board under Ceramic Tile

Section. Steel stud requirements for DUROCK Cement Board

installations: min. 20 ga.; max. spacing 16".

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3.02 CHASE WALL ERECTION:

Align two parallel rows of floor and ceiling runners

spaced apart as shown on drawings. Attach to concrete

slabs with concrete stub nails or power-driven anchors

24" o.c. max.; to suspended ceilings with toggle bolts

or hollow wall anchors 16" o.c. max.

Position studs vertically in runners (16") (24") o.c.

with flanges in same direction, and with studs on

opposite sides of chase directly across from each

other.

Place cross bracing made of gypsum panels, minimum 12"

high by chase wall width, between rows of studs and

attach to stud webs with six 1" Type S screws per

brace. Space braces 48" o.c. vertically.

Bracing of 2-1/2" steel studs may be used in place of

gypsum panels. Anchor web at each end of steel brace

to stud web with two 3/8" pan head screws. When chase

wall studs are not opposite install steel stud cross

braces 24" o.c. horizontally and securely anchor each

end to a continuous horizontal 2-1/2" runner screw-

attached to chase wall studs within the cavity

3.03 DRYWALL SOFFIT ERECTION:

Attach steel runners 24" o.c. to concrete slabs with

concrete stub nails or power-driven anchors; to

suspended ceilings with toggle bolts or hollow wall

anchors. On stud walls space fasteners to engage each

stud. Fasten vertical face panel to web of face corner

runner and flange of ceiling runner with 1" screws 12"

o.c. For braced furring insert steel studs between

face corner runners, sidewall and ceiling runners and

attach studs to runners with metal lock fastener or pan

head framing screws. Attach face panels with 1" screws

12" o.c.

3.04 CEILING INSTALLATION:

3.04.1 Grillage Erection:

Space 9-ga. hanger wires 48" o.c. along carrying

channels and within 6" of ends of carrying channel run.

In concrete, anchor hangers by attachment to

reinforcing steel by loops embedded at least 2", or by

approved inserts. For steel construction wrap hanger

around or through beams or joists.

Install 1-1/2" carrying channels 48" o.c. and within 6"

of walls, positioned for proper ceiling height. Level

and secure with hanger wire saddle-tied along channel.

Provide 1" clearance between runners and abutting

walls. At channel splices interlock flanges,

overlap ends 12" and secure each end with double-

strand 18- ga.tie wire.

Erect metal furring channels at right angles to 1-1/2"

carrying channels. Space furring (16")(24") o.c. and

within 6" of walls; secure to carrying channels with

clips or wire-tie with double-strand 18-ga. wire. At

splices nest furring channels 8" and securely wire-tie

each end with double-strand 18-ga. wire.

At light troffers or any openings that interrupt the

carrying or furring channels install necessary

reinforcing to insure lateral stability of grillage.

3.04.2 Steel Stud Framing System Erection:

Attach runners at proper height through gypsum panels

to each partition stud with two screws. Insert studs

in runners and attach each end with one pan head

framing screw. Install 1-5/8" stud cross-bracing over

stud framing; space 48" o.c. and attach to each framing

stud with two pan head framing screws. At hangers

install 12" long stud section for box reinforcing or

lap studs 12" and secure each end with two pan head

framing screws.

3.04.3 Gypsum Panel Erection:

Apply gypsum panels of maximum practical length with

long dimension perpendicular to furring channels.

Position end joints over channel web and stagger in

adjacent rows. Fit ends and edges closely, but not

forced together. Fasten panels to channels with 1"

Type S screws 12" o.c. in field of panel and along ends

and edges.

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For fire rated ceiling assemblies refer to the particular test or

design for framing, furring, and screw spacing. Note need for

additional channels at gypsum panel ends.

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See System Folder SA-923 for beam and column fireproofing

requirements.

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3.05 WALL FURRING INSTALLATION:

3.05.1 Direct Furring Channel Attachment"

Attach metal furring channels (vertically)

(horizontally) spaced (16")(24") o.c. to masonry or

concrete surfaces with concrete stub nails or power-

driven fasteners staggered 24" on opposite flanges. On

exterior walls install asphalt felt protection strip

between furring channel and wall.

Apply gypsum panels (parallel to channels)

(perpendicular to channels). Position all edges over

channels in parallel application; all ends over

channels in perpendicular application with joints

staggered in successive courses. Fit ends and edges

closely, but not forced together; fasten panels to

channels with 1" Type S screws 16" o.c.

3.05.2 SHEETROCK Z-Furring Channels:

Erect insulation vertically and hold in place with

SHEETROCK Z-Furring Channels spaced 24" o.c. Attach

narrow flanges of furring channels to wall with

concrete stub nails or power-driven fasteners spaced

24" o.c. At exterior corners attach wide flange to

wall with short flange extending beyond corner. On

adjacent wall surface screw attach short flange of

channel to web of attached channel. Start from this

channel with standard width insulation and continue in

regular manner. At interior corners space second

channel no more than 12" from corner and cut insulation

to fit. Hold insulation in place until gypsum panels

are installed with 10" long staple field-fabricated

from 18-ga. tie wire inserted through slot in channel.

Apply gypsum panels parallel to channels with vertical

joints over channels. Attach panels with 1" Type S

screws spaced 16" o.c. in field and at edges, and 1-

1/4" Type S screws 12" o.c. at exterior corners.

3.06 LAMINATION TO INTERIOR CONCRETE/MASONRY:

Concrete or masonry shall be clean, smooth and dry

prior to application. Cut gypsum panels to allow

continuous clearance - 1/8" to 1/4" - at floor. Apply

laminating adhesive at center and near each panel edge

in strips consisting of 4 beads, 3/8" wide x 1/2" high

and spaced 1-1/2" to 2" o.c. Position panels

vertically over wall surface, press into place and

provide temporary support until adhesive is hardened.

3.07 ACCESSORY APPLICATION:

3.07.1 Corner Bead - Reinforce all vertical and horizontal

exterior corners with corner bead fastened

with 9/16" galvanized staple 9" o.c. on both flanges

along entire length of bead.

3.07.2 Metal Trim - Where assembly terminates against masonry

or other dissimilar material, and where shown on

drawings, apply metal trim over panel edge and fasten

with 9/16" galvanized staple 9" o.c.

3.07.3 Control Joints - Break panel behind joint and back by

double framing members. Apply acoustical sealant to

fill gap and attach 093 Control Joint to face layer

with 9/16" galvanized staples 6" o.c. on both flanges

along entire length of joint.

3.07.4 Acoustical sealant - Apply SHEETROCK Brand Acoustical

Sealant at the perimeter of all sound rated partitions

with 1/4" minimum round bead or beads as shown on

drawings. Apply sealant to the back and sides of

electrical boxes, around perimeter of electrical boxes,

and around all penetrations to prevent sound flanking.

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For fire-rated assemblies control joint must be properly backed-

up to maintain the fire integrity - see System Folder SA-923.

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3.08 JOINT TREATMENT APPLICATION:

3.08.1 Gypsum Panel Joints:

Mix joint compound in strict accordance with

manufacturer's recommendations. Apply joint compound

in a thin uniform layer to all joints and angles to be

reinforced. Immediately apply joint tape centered over

joint and seated into compound. Sufficient compound -

appx. 1/64" to 1/32" - must remain under the tape for

proper bond. Follow immediately with a thin skim coat

to embed tape but not to function as a second coat.

Fold and embed tape properly in all interior angle to

provide a true angle. Allow embedding coat to dry

thoroughly prior to application of second coat.

Apply second coat of joint compound filling panel taper

flush with surface; cover tape and feather out at least

2" beyond first coat. On joints with no taper cover

the tape and feather out at least 4" on either side of

tape. Allow second coat to dry thoroughly prior to

application of finish coat.

Spread finish coat evenly over and extend at least 2"

beyond second coat on all joints and feather to a

smooth uniform finish. Apply a finish coat to cover

tape and taping compound at all tapered angles and

provide a true angle. Where necessary sand lightly

between coats and following the final application of

compound to provide a smooth surface ready for

decoration.

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Setting type joint compounds need only have hardened prior to

application of next coat.

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3.08.2 Finishing Fasteners:

Apply joint compound to fastener depressions as the

first coat. Follow with a minimum of two additional

coats of joint compound leaving all depressions level

with the surface.

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SHEETROCK Lightweight All Purpose Joint Compound Ready-Mixed

(PLUS 3) requires only one additional coat.

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3.08.3 Finishing Beads and Trim:

Apply first coat to all beads and trim and properly

feather out from ground to plane of surface. Allow

joint compound to thoroughly dry prior to application

of second coat

Apply second coat in same manner, extending compound

slightly beyond onto face panel. Allow to thoroughly

dry prior to application of finish coat.

Apply finish coat extending compound slightly beyond

second coat and properly feather from ground to

surface. Sand as necessary to provide a flat smooth

surface ready for decoration.

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SHEETROCK Lightweight All Purpose Joint Compound Ready-Mixed

(PLUS 3) requires only two coats.

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3.08.4 Filling and Finishing Interior Concrete:

Concrete surface shall be clean, smooth, dry and free

from contaminants and exposed metal protected with a

rust inhibitive primer and allowed to dry. Fill

offsets and voids with setting type joint compound.

Mix (COVER COAT Compound) (SHEETROCK Setting Type

Compound) (SHEETROCK Lightweight Setting Type Compound)

according to manufacturer's directions and apply to

concrete (ceilings) (columns) before interior

partitions are erected. Install N0.800 Corner Bead to

exterior corners, embedding and covering both flanges

with a smooth fill of compound 3" to 4" wide. Apply

sufficient coats to concrete surfaces to obtain a

smooth surface. After compound has dried sand to a

smooth surface suitable for decoration.

3.09 CLEAN-UP:

When gypsum drywall work is completed remove temporary

protection and enclosure of other work. Promptly

remove joint compound from doors and frames, windows

and other surfaces. Remove unused materials and

equipment and clean floors of gypsum drywall and

framing debris.

End of Section 09250

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A limited license is extended to qualified design professionals

to duplicate and print this guide specification for the purpose

of incorporating products manufactured and/or sold by U.S. Gypsum

Co. into a construction specification or purchase order.

Notice: We shall not be liable for incidental and consequential

damages, directly or indirectly sustained, nor for any loss

caused by application of these goods not in accordance with

current printed instructions or for other than the intended use.

Our liability is expressly limited to replacement of defective

goods. Any claim shall be deemed waived unless made in writing

to us within thirty (30) days from date it was or reasonably

should have been discovered.

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